[MCPE-127757] Goat ram impact sounds doesn't use impact3 sounds

Summary
The goat's ram impact sounds only play two sounds in-game because impact2 sound was mentioned twice in the sound_definitions JSON files, causing impact3 to be not played in-game at all.

"mob.goat.ram_impact": {
      "category": "hostile",
      "sounds": [
        {
          "name": "sounds/mob/goat/impact1",
          "volume": 0.8
        },
        {
          "name": "sounds/mob/goat/impact2",
          "volume": 0.8
        },
        {
          "name": "sounds/mob/goat/impact2",
          "volume": 0.8
        }
      ]
    },
    "mob.goat.ram_impact.screamer": {
      "category": "hostile",
      "sounds": [
        {
          "name": "sounds/mob/goat/impact1",
          "volume": 0.8
        },
        {
          "name": "sounds/mob/goat/impact2",
          "volume": 0.8
        },
        {
          "name": "sounds/mob/goat/impact2",
          "volume": 0.8
        }
      ]
    },